Mitsubishi Pajero Pinin. Manual - part 188

AUTOMATIC TRANSMISSION – 

General/Troubleshooting <A/T>

23-2

GENERAL

OUTLINE OF CHANGES

The following service procedures for items which are different from before have been established to correspond
to the following changes:



The A/T-ECU has been changed.



The shift pattern has been changed.

TROUBLESHOOTING <A/T>

SHIFT PATTERN

D range (Overdrive switch: ON)

Throttle opening (%)

100

80

0

1,000

2,000

3,000

4,000

5,000

6,000

Output shaft speed r/min

0

50

100

150

Vehicle speed km/h

2

3

4

60

40

20

1

2

1

3

2

3

4

3

2

INSPECTION CHART FOR DIAGNOSIS CODE

Code

Diagnosis item

Reference page

13

Accelerator pedal position sensor system 
(Throttle opening voltage)

Sensor malfunction/
open circuit/short circuit

23-3

14

Accelerator pedal position sensor system 
(Throttle power supply voltage)

Open circuit/short circuit

23-3

15

A/T fluid temperature sensor system

Open circuit

23-4

16

A/T fluid temperature sensor system

Short circuit

23-4

22

Wide open throttle system

Open circuit/short circuit

23-4

29

Inhibitor switch system

Open circuit

23-5

30

Inhibitor switch system

Short circuit

23-5

31

Input shaft speed sensor system

Open circuit

23-6

32

Output shaft speed sensor system

Open circuit

23-6

38

Vehicle speed sensor system

Open circuit

23-7

41

Solenoid valve No. 1 system

Open circuit

23-8

42

Solenoid valve No. 1 system

Short circuit

23-8

AUTOMATIC TRANSMISSION – 

Troubleshooting <A/T>

23-3

Code

Reference page

Diagnosis item

43

Solenoid valve No. 2 system

Open circuit

23-8

44

Solenoid valve No. 2 system

Short circuit

23-8

47

Solenoid valve No. 3 system

Open circuit

23-8

48

Solenoid valve No. 3 system

Short circuit

23-8

55

Abnormal communication with engine-ECU

Open circuit

23-9

INSPECTION PROCEDURES FOR DIAGNOSIS CODES

Code No. 13, 14  Accelerator pedal position sensor (APS)

Probable cause

If the APS output voltage (APS opening voltage) is 4.8 V or higher when the engine
is idling, the output voltage is judged to be too high and diagnosis code No. 13
is output. If the APS output voltage (APS opening voltage) is 0.335 V or lower
when the engine is idling, the output voltage is judged to be too low and diagnosis
code No. 13 is output.
If the APS output voltage (APS power supply voltage) is 3.0 V or lower or if it
is 5.7 V or higher when the engine is idling, the APS is judged to be faulty and
diagnosis code No. 14 is output.



Malfunction of the accelerator pedal position sensor



Malfunction of harness or connector



Malfunction of the A/T-ECU

*: Refer to ’00 PAJERO PININ Workshop Manual (Pub. No. CKRE00E1).

Accelerator pedal position sensor check
(Refer to GROUP 13A – On-vehicle Service.)*

NG

Replace

OK

Check the following connectors:
<L.H. drive vehicles> C-46, C-25, D-34, D-46
<R.H. drive vehicles> C-46, C-26, D-34, D-46

NG

Repair

OK

Check the trouble symptoms.

NG

Replace the A/T-ECU.

NG

Repair

OK

Harness check



Between accelerator pedal position sensor and A/T-ECU

AUTOMATIC TRANSMISSION – 

Troubleshooting <A/T>

23-4

Code No. 15, 16 A/T fluid temperature sensor system

Probable cause

If the A/T fluid temperature sensor output is 10



C or less (5.6 k

Ω

 or more) even

after running the engine for 15 minutes or more, it is judged that there is an open
circuit in the A/T fluid temperature sensor and diagnosis code No. 15 is output.
If the A/T fluid temperature sensor output is 240



C or more (10 k

Ω

 or less), it is

judged that there is a short circuit in the A/T fluid temperature sensor and diagnosis
code No. 16 is output.



Malfunction of the A/T fluid temperature sensor



Malfunction of harness or connector



Malfunction of the A/T-ECU

*: Refer to ’00 PAJERO PININ Workshop Manual (Pub. No. CKRE00E1).

A/T fluid temperature sensor check (Refer to P.23-43.)*

NG

Replace

OK

Check the following connectors: B-03, D-45

NG

Repair

OK

Check the trouble symptoms.

NG

Replace the A/T-ECU.

NG

Repair

OK

Harness check



Between A/T fluid temperature sensor and A/T-ECU

Code No. 22 Wide open throttle switch system

Probable cause

If the wide open throttle switch dose not turn OFF with the accelerator pedal is
not depressed, there is a short circuit in the wide open throttle switch and diagnosis
code No. 22 is output.



Malfunction of the wide open throttle switch



Malfunction of harness or connector



Malfunction of the A/T-ECU

*: Refer to ’00 PAJERO PININ Workshop Manual (Pub. No. CKRE00E1).

NG

Replace

OK

NG

OK

NG

Repair

OK

Replace the A/T-ECU.

Wide open throttle switch check (Refer to P.23-51).*

Harness check



Between the wide open throttle switch and the A/T-ECU
connectors, and repair if necessary.

Check the following connectors: C-58, D-34, D-46

OK

Measure at wide open throttle switch connector C-58.



Disconnect the connector and measure at the harness side.



Voltage between terminal 1 and earth
(ignition switch: ON)
OK: System voltage

NG

Repair

OK

Check the following connector: D-46

OK

Check the trouble symptoms.

Check the trouble symptoms.

NG

Repair

OK

Harness check



Between the wide open throttle switch and the A/T-ECU
connectors.

AUTOMATIC TRANSMISSION – 

Troubleshooting <A/T>

23-5

Code No. 29, 30 Inhibitor switch system

Probable cause

If the inhibitor switch has not sent any signal for 2 seconds while the ignition switch
is on, it is judged that there is an open circuit in the inhibitor switch and diagnosis
code No.29 is set.
If the inhibitor switch has sent at least two signals simultaneously for 2 seconds
while the ignition switch is on, it is judged that there is an short circuit in the inhibitor
switch and diagnosis code No.30 is set.



Malfunction of the inhibitor switch



Malfunction of harness or



Malfunction of the A/T-ECU

*: Refer to ’00 PAJERO PININ Workshop Manual (Pub. No. CKRE00E1).

OK

End

NG

NG

OK

NG

Repair

NG

Check the ignition switch. (Refer to GROUP 54 - ignition switch.)*

MUT

ĆII

 SERVICE DATA



37 Inhibitor switch
OK: The MUT-II should display a correct selector lever posi-

tion.

OK

Measure at inhibitor switch connector B-04.



Disconnect the connector and measure at the harness side.



Voltage between terminal 8 and earth
(ignition switch: ON)
OK: System voltage

NG

Repair

OK

Check the following connectors: D-02, C-26, C-74, C-78

OK

Check the trouble symptoms.

Check the trouble symptoms.

NG

Repair

OK

Harness check



Between the inhibitor switch and the ignition switch

Replace

Inhibitor switch check (Refer to P.23-37).*

NG

Repair

OK

Check the following connectors: B-04, D-46

Replace the A/T-ECU.

OK

NG

Harness check



Between the inhibitor switch and the A/T-ECU